*** 20 INJ *** THIS TORNADO BEGAN WEST OF THE CANADIAN RIVER... OR ABOUT 3.7 MILES SW OF NORMAN. THE TORNADO ENTERED THE SOUTHWEST SIDE OF NORMAN AT 1601 AND CROSSED I-35 A SHORT TIME LATER. EF-1 DAMAGE OCCURRED IN TWO PLACES... ONE WAS ON EITHER SIDE OF THE INTERSTATE... AND THE OTHER WAS BETWEEN LAHOMA AND PETERS AVENUES NORTH OF MAIN STREET. THE TORNADO FINALLY LIFTED NEAR NE 12TH AND ROBINSON STREET AT 1612 CDT.